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WAEC - Further Mathematics (2011 - No. 33)

Two forces 10N and 15N act on an object at an angle of 120° to each other. Find the magnitude of the resultant.
\(5\sqrt{5}N\)
\(5\sqrt{7}N\)
\(7\sqrt{5}N\)
\(7\sqrt{7}N\)

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